La source (2013)

20-year-old Marie is a student and an au-pair for the family of John and Esther Lacanal. Housed in their beautiful in a chic district of Paris, she looks after their two children, Walter, 11, and Suzy, 8. One day, as she's waiting for the kids outside school, Marie gives a helping hand to Claire Perrini: to all appearances, a mother in distress after a fight with her husband - but in reality, a French secret service agent. Marie's employer, John Lacanal, vice-CEO of Aloe Vera, a multinational that specializes in toxic-waste treatment, is in Claire's line of fire. Marie, who works closely within the family circle, can do a great service to her country by acting as a source. And it's urgent: Mylène, an agent undercover inside Aloe Vera, has just died in suspicious circumstances - Marie really has no choice: the secret service knows her weak point. Overnight, her life is overturned as Marie is caught in a spiral. From now on, the secret service can at any moment activate their source.